So everyone should be wearing a helmet... but if you don't like the way they look, or perhaps they aren't comfortable for you here's a solution! This beanie helmet by Ignite. Looks good and you can't even tell that you are protecting yourself!
(buy one here: http://www.ignitebeanies.com/)
Here's a great video showing how it works! Well only kind of...
P.S. This post is all thanks to Ryan the Bicycle Lion.